Incident at 62N 105W - near the border of Saskatchewan and NWT (Conflict - loss of separation, ATS operating irregularity)

Summary

2001-06-05: UPDATE TSB reported that ACA 845 was an Airbus A340-300 en route from Frankfurt, Germany to Calgary, AB. BAW 49 was a Boeing 747-200 en route from Heathrow, London to Seattle, Washington. ACA 845 was maintaining 35,000 feet while BAW 49 was at 33,000 feet and had requested 35,000 feet. At 1220, ACA 845 was re-routed to provide lateral separation from BAW 49. BAW 49 was then cleared to 35,000 feet. At 1945, the crew of ACA 845 advised that they had traffic in sight on their left and were altering course to the right. The aircraft came within approximately 7 NM of each other at the same altitude where 20 NM or 2,000 feet of separation is required. TSB will conduct a Class 3 investigation of this occurrence.
2001-06-04: UPDATE ANS and Airspace reported that NAV CANADA will hold a Fact Finding Board.
2001-06-01: BAW 49, a B747, was enroute from London FPR 6430N100W YBE FPR to Seattle, maintaining FL 350. ACA 845, an A340, was enroute from Frankfurt FPR 6530N 100W FPR TORON to Calgary, maintaining FL 350. At 1945Z when the two a/c were near 65N 105W, the crew of ACA 845 reported that they were turning right reference traffic to their left. Control action was initiated and ACA 845 was cleared to maintain FL 370. It has been determined that the spacing between the aircraft was reduced to less than the required lateral standard of 20 miles. The NAV CANADA investigation is continuing and TSB has been advised.

Details


CADORS Number 2001C0555
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 2001-05-31 - 19:45
Day or Night? Day-time
Fatalities 0
Injuries
Aerodrome ID
Aerodrome Name
Geographic Location Northwest Territories, Canada, North America, Prairie and Northern Region, 62N 105W - near the border of Saskatchewan and NWT
TSB Occurrence Number A01W0129
TSB Class of Investigation Class 3
AOR Number 15524
Reported By NAV CANADA
Categories Airprox/TCAS alert/loss of separation/(near) midair collisions,ATM/CNS
Events Conflict - loss of separation,ATS operating irregularity


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